Membrane for manometers



Oct. 20,1925- 1.558,173

P. JATOW IEIBRANE ion unonsrsns Filed March 20. 1925 Patented Oct. 20,1925.

UNITED STATES PATENT OFFICE.

PAUL J'ATOW, 0 F DODENDORF, NEAR MAG-DEBURG, GERMANY, A'SSIGNOR TOSCHKFFER & BUDENBERG, G. M. B. 1-1., OF BUCKAU', NEAR MAGDEBURG,GERIVIANY.

MEMBRANE FOR MANOMETERS.

Application filed March 20, 1925. Serial No. 17,140.

To all whom it may concern:

Be it known that I, PAUL JATOW, a subject of the German Republic,residing at Dodendorf, near Magdeburg, Germany, have invented certainnew and useful Improvements in Membranes for Manometers, of which thefollowing is a specification.

The plate and membrane springs of manometers and also of aneroidbarometers, which it is desired to protect against overloading or stresswhen at work, must be faultlessly applied to the plant or casing wallunder the maximum possible load or stress. As however, for the purposeof bettcr resiliency or springiness, the membrane must be provided withconcentric ribs (see Figure 1) thus upon an overloading of the platespring only the annular collars a, 6, etc., come into contact with thecorresponding points a 6 etc., on the casing, so that an increasedpressure can still always deform the spring.

Now according to the present invention, by means of a special formationof the corrugation cross sections of the membrane spring, alterations inthe elasticity of the membrane spring are to be entirely avoided, sothat the alterations in pressure in such measuring instruments can beindicated for a much longer period of time and with greater accuracythan heretofore.

In the accompanying drawings Figure l is the known constructional formin cross section;

Figure 2 is a cross section of the membrane or diaphragm springaccording to the invention; and

Figure 3 is the same in plan.

The annular collars a, b of the type so far known, which however bearagainst the 40 points 6 6 (see Figure l) are, according to the presentinvention, only pressed in one side upon the side turned towards theinflowing pressure medium. The back of the membrane or diaphragm, whichin the case of excessive pressure, bears upon the casing wall turned offat the top, forms a flat surface which is only interrupted by the narrowannular grooves.

A deformation of the spring by excessive pressure is not possible in thecase of the new construction, because the points c-d, ef, etc, (Figure2) running in a straight line bear upon any excess of pressure upon acorresponding straight surface 0 d e f of the flat casing wall. Upon thering-shaped collars the pressure can only act in a radial direction,just as upon a cylinder jacket, and hence no deformative moments offleXure occur.

lVhat I claim and desire to secure by Letters Patent of the UnitedStates is:

In a measuring instrument, a chamber having a pressure medium inlet, aresilient diaphragm arranged in said chamber and having substantiallyflat annular surfaces alternating with annular corrugations directedtoward the inlet side of said chamher, and a substantially flatsupporting surface on one wall of said chamber, against which the flatannular surfaces of the diaphragm immediately abut when the normalmaximum pressure is exceeded.

PAUL J ATOW

